<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <script src="js/first.js"></script>

    <script>
    alert("1111")

    /**
     多行注释
     */

    /* 单行注释 */

    </script>

</head>
<body>
    <script>
        alert("222222")
    </script>


</body>

<script>
    alert("3333")
</script>


</html>